Health risk assessment of polychlorinated biphenyls exposure from inland rivers sediments in Warri-South, Warri, Delta State

The health risk of polychlorinated biphenyls (PCBs) exposure from Ugbuwangue, Ugbori and Edjeba rivers sediments in Warri-South, Warri, Delta State was investigated. Nine sediment samples were collected; three samples each along the course of the different rivers. The sediment samples were Soxhlet extracted with acetone/dichloromethane/ n hexane (1:1:1 v/v). A total of 28 PCBs were quantified using gas chromatography coupled with mass spectrometry detector. The concentration of the 28 PCBs ranges from 178.76-1398.29 ng g −1 for Ugbuwangue river, 224.81-685.19 ng g-1 for Ugbori river and 539.33-7858.3 ng g −1 for Edjeba river. The concentration of 12 PCBs were recorded for dioxin-like PCBs ranged from 0.08-401.52 ng g −1 (Ugbuwangue river 0.13 to 223.11 ng g −1 , Ugbori river 0.08 to 153.39 ng g −1 and Edjeba river 0.32 to 401.52 ng g −1 ), while the concentration of 16 non-dioxin-like PCBs were recorded ranging from 0.13-4245.71 ng g −1 (Ugbuwangue river 0.18 to 386.47 ng g −1 , Ugbori river 0.13 to 111.98 ng g −1 and Edjeba river 0.31 to 4245.71 ng g −1 ). The ecological risks of the nine sediment samples were investigated and it ranges from 25.52 – 1122.616 with Edjeba river sediment having the highest ecological risk while Ugbuwangue river sediment has the least ecological risk.